Drybar Detox Dry Shampoo, $20

The hack: Good old dry shampoo is a gym bag mainstay: a few spritzes on roots (followed by a quick shot of the blow dryer) and your hair is completely refreshed. But you can also spritz it in your shoes and bag; the ingredients that deodorize your hair work just as well at deodorizing your stuff. Sephora.com